The following six sentences come from a paragraph. The first and the last sentences are given. Choose the order in which the four sentences (PQRS) should appear to complete the paragraph.
S1: There was no limit to insanitation.
S6: So I asked for a broom to clean them myself.
P: There were only a few latrines.
Q: They refused point-blank to clean them.
R: Pools of water were everywhere.
S: I pointed this fact out to the volunteers.
The proper sequence should be: